Filtering device
US4944125A · kind A · utility
10Cited by
10References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 3, 1989 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | May 3, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S47/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A filtering device for use in shutting out a greater portion of the ultraviolet and infrared rays but admitting the passage of visible lights indispensable to the growth of plants and human life, the device including a mixture and a container for holding the mixture, the mixture containing water, a compound dissociable into ferrous salt ions, and at least one of L-ascorbic acid and D-ascorbic acid, the container comprising transparent members disposed face to face with each other, with the mixture confined therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.